A gamma ray photon creates an electron-positron pair. If the rest mass energy of an electron is `0.5 MeV` and the total `K.E.` of the electron-position pair is `0.78 MeV`, then the energy of the gamma ray photon must be.

A gamma ray photon creates an electron positron pair. If the rest mass energy of an electron is 0.5 MeV and the total kinetic energy of the electron positron pair is 0.78 MeV, then the energy of the gamma ray photon must be

To produce an electron-position pair, the minimum energy of gamma -ray photon must be

The rest mass energy of electron or positron is (in MeV )

The rest energy of an electron is 0.511 MeV. The electron is accelerated from rest to a velocity 0.5 c. The change in its energy will be

In pair annihiliation the least number of gamma -ray photons produced is

A 5 xx 10^(-4) Å photon produces an electron-positron pair in the vincinity of a heavy nucleus. Rest energy of electron is 0.511 MeV . sIf they have the same kinetic energies, the energy of each paricles is nearly

A 5 xx 10^(-4) Å photon produces an electron-positron pair in the vincinity of a heavy nucleus. Rest energy of electron is 0.511 MeV . sIf they have the same kinetic energies, the energy of each paricles is nearly